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| Study on Shrinkage Ratio of Cast High Nb-TiAl Alloy Based on Orthogonal Test |
| LIU Jinhu1, DING Xianfei1,2,3, FENG Xin1,2,3, NAN Hai1,2,3 |
1. Cast Titanium Alloy R&D Center, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China;
2. BAIMTEC Material Co., Ltd, Beijing 100094, China;
3. Beijing Engineering Research Center of Advanced Titanium Alloy Precision Forming Technology, Beijing 100095, China |
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Abstract The effects of geometric shape, resisted shrinkage and free shrinkage, sample size on the linear shrinkage ratio of two high Nb-TiAl alloy investment castings were investigated by orthogonal test. The results show that the average linear shrinkage ratio of Ti–45Al–8Nb is 2.12%–3.28%, and the average linear shrinkage ratio of Ti–48Al–7.5Nb is 2.55%–3.39%, and the linear shrinkage ratio of the latter is larger. The linear shrinkage ratio of the resisted shrinkage specimen in the unblocked direction is 44.8%–47.7% higher than that of the free shrinkage specimen. The geometry and size have little effect on the linear shrinkage ratio, and resistance to solidification shrinkage has a greater impact on linear shrinkage ratio. As the sample size increases, the linear shrinkage increases by 100%, but the linear shrinkage ratio gradually decreases to 20%.
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2019, 
